libceph: osd_init() and osd_cleanup()

These are going to be used by homeless OSD sessions code.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 4227c55..77f37b6 100644 (file)
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -864,6 +864,11 @@ EXPORT_SYMBOL(ceph_osdc_new_request);
  */
 DEFINE_RB_FUNCS(request, struct ceph_osd_request, r_tid, r_node)
 
+static bool osd_homeless(struct ceph_osd *osd)
+{
+       return osd->o_osd == CEPH_HOMELESS_OSD;
+}
+
 static struct ceph_osd_request *
 __lookup_request_ge(struct ceph_osd_client *osdc,
                    u64 tid)
@@ -1002,28 +1007,52 @@ static void osd_reset(struct ceph_connection *con)
 }
 
 /*
+ * Assumes @osd is zero-initialized.
+ */
+static void osd_init(struct ceph_osd *osd)
+{
+       atomic_set(&osd->o_ref, 1);
+       RB_CLEAR_NODE(&osd->o_node);
+       INIT_LIST_HEAD(&osd->o_requests);
+       INIT_LIST_HEAD(&osd->o_linger_requests);
+       INIT_LIST_HEAD(&osd->o_osd_lru);
+       INIT_LIST_HEAD(&osd->o_keepalive_item);
+       osd->o_incarnation = 1;
+}
+
+static void osd_cleanup(struct ceph_osd *osd)
+{
+       WARN_ON(!RB_EMPTY_NODE(&osd->o_node));
+       WARN_ON(!list_empty(&osd->o_requests));
+       WARN_ON(!list_empty(&osd->o_linger_requests));
+       WARN_ON(!list_empty(&osd->o_osd_lru));
+       WARN_ON(!list_empty(&osd->o_keepalive_item));
+
+       if (osd->o_auth.authorizer) {
+               WARN_ON(osd_homeless(osd));
+               ceph_auth_destroy_authorizer(osd->o_auth.authorizer);
+       }
+}
+
+/*
  * Track open sessions with osds.
  */
 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
 {
        struct ceph_osd *osd;
 
+       WARN_ON(onum == CEPH_HOMELESS_OSD);
+
        osd = kzalloc(sizeof(*osd), GFP_NOFS);
        if (!osd)
                return NULL;
 
-       atomic_set(&osd->o_ref, 1);
+       osd_init(osd);
        osd->o_osdc = osdc;
        osd->o_osd = onum;
-       RB_CLEAR_NODE(&osd->o_node);
-       INIT_LIST_HEAD(&osd->o_requests);
-       INIT_LIST_HEAD(&osd->o_linger_requests);
-       INIT_LIST_HEAD(&osd->o_osd_lru);
-       osd->o_incarnation = 1;
 
        ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
 
-       INIT_LIST_HEAD(&osd->o_keepalive_item);
        return osd;
 }
 
@@ -1044,8 +1073,7 @@ static void put_osd(struct ceph_osd *osd)
        dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
             atomic_read(&osd->o_ref) - 1);
        if (atomic_dec_and_test(&osd->o_ref)) {
-               if (osd->o_auth.authorizer)
-                       ceph_auth_destroy_authorizer(osd->o_auth.authorizer);
+               osd_cleanup(osd);
                kfree(osd);
        }
 }